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From: rjay220033 on 20 Apr 2008 18:33

hi,
have just bought a couple of cheap and cheerful matching 350w psu's,
and ive got concerns over their ability to sustain my mobo voltages,
because i have 6+ hdds, with future expansion planned
and yes in the past ive used a paperclip to operate a psu without
switch
would it be worth splicing the atx connectors in parralel to combat
this,
ive just got visions of the psu's overloading the board by offering too
high a current
is there such a thing?
opinions?


From: CBFalconer on 20 Apr 2008 21:46
rjay220033 wrote:
>
> have just bought a couple of cheap and cheerful matching 350w
> psu's, and ive got concerns over their ability to sustain my mobo
> voltages, because i have 6+ hdds, with future expansion planned
> and yes in the past ive used a paperclip to operate a psu without
> switch would it be worth splicing the atx connectors in parralel
> to combat this, ive just got visions of the psu's overloading the
> board by offering too high a current is there such a thing?
> opinions?

The use of capital letters at the head of sentences, and periods at
the ends, is recommended.

No. Paralleled power supplies don't, unless they have well
designed current limiting circuitry. The one supply whose basic
output is 1 millivolt higher than the others will do all the work,
and self destruct.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home.att.net>
Try the download section.


** Posted from http://www.teranews.com **
From: Paul on 20 Apr 2008 22:32
rjay220033 wrote:
> hi,
> have just bought a couple of cheap and cheerful matching 350w psu's,
> and ive got concerns over their ability to sustain my mobo voltages,
> because i have 6+ hdds, with future expansion planned
> and yes in the past ive used a paperclip to operate a psu without
> switch
> would it be worth splicing the atx connectors in parralel to combat
> this,
> ive just got visions of the psu's overloading the board by offering too
> high a current
> is there such a thing?
> opinions?
>

You can do the following - connect the soft-power control in parallel.
Connect the grounds on the supplies together. Now, when the
motherboard drives PS_ON# active logic low, both supplies come
on at the same time.

One supply powers the motherboard. The other supply powers the
disk drives. This prevents "sneak paths" between supply outputs.
You also have to consider what happens, if one supply fails to
start, for any reason.

+----------------+
| |
Motherboard | |
-------+-----------------| +12 |------ To motherboard and
24 pin | PS_ON# | Power +5 |------ PCI Express cards
| | Supply +3.3 |------
------ | --+-------------| |
| | COM (GND) | |
| | +----------------+
| |
| |
| |
| | +----------------+
| | | |
| | | |
+-- | ------------| +12 |------ To hard drives only
| PS_ON# | Power +5 |------
| | Supply +3.3 |------/
+-------------| |
COM (GND) | |
+----------------+


To give an example of a product designed with two power supplies on
purpose, have a look at the Antec P190 computer case. It has two
power supplies. A 650W primary supply. A 550W secondary supply.
The primary powers the motherboard and PCI Express cards. The
secondary powers hard drives and peripherals. To do that, they would
use the figure at the top of this posting.

Neo-Link 1200W (dual) supply
http://www.antec.com/pdf/flyers/Neo-link_flyer.pdf

There are pictures of that dual supply here. They may have
mixed and matched the pictures of the front and back of these
units. I'm not sure the two pictures on page 7, go with one
another. But at least it illustrates the concept (of only
hooking the PS_ON# signals together, and not the outputs).

http://www.hi-techreviews.com/reviews_2007/Antec_190/Page7.htm

You can see the controls hooked together here. What would be
a real bonus, is if the bloody thing had a decent manual. The info
I could find on the Antec site, is sparse indeed.

http://plaza.fi/muropaketti/artikkelit/kotelot/antecin-kotelot-testissa-fusion-black-430-p190,4

Paul
From: manny on 21 Apr 2008 08:49


rjay220033 wrote:
> hi,
> have just bought a couple of cheap and cheerful matching 350w psu's,
> and ive got concerns over their ability to sustain my mobo voltages,
> because i have 6+ hdds, with future expansion planned
> and yes in the past ive used a paperclip to operate a psu without
> switch
> would it be worth splicing the atx connectors in parralel to combat
> this,

For you, yes, it would be a good idea because you're a pest and seem
to be an incredible lightweight who works in sales or advertising, and
I want to see you ruin your computer.

But you shouldn't parallel them because "psu's" can't regulate
themselves when you parallel their wires, so instead divide up your
load between one supply for the motherboard and its cards and another
supply for just the drives. Connect each supply's green turn-on wire
to one another, and have the supply cases well connected to the same
ground, such by bolting them both to the case.

You'll never catch me using Cheerful power supplies. Even I'm not
that cheap.

From: kony on 21 Apr 2008 09:46
On Sun, 20 Apr 2008 17:33:37 -0500, rjay220033
<rjay220033.386zrf(a)no.email.invalid> wrote:

>
>hi,
>have just bought a couple of cheap and cheerful matching 350w psu's,

It doesn't matter that they are matching, you can't splice
them together to share current for the same devices powered
because they both independantly regulate and each slightly
different output voltages (depending on load too).

>and ive got concerns over their ability to sustain my mobo voltages,
>because i have 6+ hdds, with future expansion planned

Return them both, get your money back and buy one proper
capacity PSU. There is no good substitute for this. There
may be other ways to get this to work but I suspect your
cheap and cheerful psus are generic and as such, a poor
gamble either way.

>and yes in the past ive used a paperclip to operate a psu without
>switch
>would it be worth splicing the atx connectors in parralel to combat
>this,

No do not do that.
The most you can do is splice the PS-On wires together so
they both turn on when system power switch is pressed, then
use one of them to power the CPU and motherboard connector,
and the other one to power the hard drives and optical
drive(s). Do not splice any power wiring together, only the
PS-On signal, and if they are not both mounted in a steel
chassis, also tie together a ground wire so they have a
common ground reference.


>ive just got visions of the psu's overloading the board by offering too
>high a current
>is there such a thing?
>opinions?
>

No, too high a current is not possible but you do not
understand the relevant details in why what you are wanting
to do won't work well.

Using two psu with one powering CPU and board, and the other
powering drives is possible, can be reasonable if your case
is big enough to put both PSU in it, and if both PSU were
high quality - only low capacity.

Instead you seem to have two low quality PSU which are more
likely to have lower than 350W true capacity and weak parts
like fans and capacitors that make it more failure prone.
The best choice since you have just bought these is to
return them to seller for money back, or sell them yourself,
and buy one higher quality and higher capacity good PSU. A
good quality 500W PSU will run the system as described
unless you have a very power hungry gaming video card(s).

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